Presentation on theme: "Chapter 2 Resonance Perry C. Hanavan, Au.D.. Question What is meant by phonation? A.Whispered speech sound B.Voiced speech sound C.Produce a nasal sound."— Presentation transcript:
Chapter 2 Resonance Perry C. Hanavan, Au.D.
Question What is meant by phonation? A.Whispered speech sound B.Voiced speech sound C.Produce a nasal sound D.Use your lips to produce sound E.I don’t know
Cultures The Jimi Hendrix of MongoliaMongolia Incredible Human MachineIncredible Human Machine Steven Tyler Wall of SoundWall of Sound Naturally 7 Dr. Patricia Kuhl: Linguist Genius of BabiesLinguist Genius of Babies
Question Who has the longer vocal folds? A.Men B.Women C.Young boys D.Young girls E.Cats
Question Whose pitch rises as they age? A.Men B.Women C.Young boys D.Young girls E.Cats
Question When does the most dramatic change in phonation occur? A.Childhood B.Pubescence C.Adulthood D.Elderly E.Infancy
VC Fundamental Frequency F o (fundamental of vocal fold vibrations) –Vocal folds/chords generate a fundamental and harmonics –Fundamental is not audible due to vocal tract resonance –Although Fo not audible, the listener perceives the audible harmonics as the Fo (perceptually as pitch) SFF = speaking fundamental frequency –Average F o of an individual during normal conversation or during oral reading
VC Fundamental Frequency SFF variations: –Age –Gender –Emotions –Sentence type –Disease –Medications
SFF and Age Infants Hz Children Hz Pubescence120 Hz - males; 220 Hz - females Seniors162 Hz - males; 177 Hz - females
Gender Pubescence –More dramatic change in males than females SFF Seniors –SFF increases in males –SFF decreases in females
Adult Gender Differences Male vocal folds: 17 mm and 25 mm (0.67" to 1.0") in length. Female vocal folds: 12.5 mm and 17.5 mm (0.5" to 0.7") in length.
Frequency Variables Stress and accent of sounds in speech Prosody features of speech Measured by: –F o SD Normal conversation Hz Varies by age, gender, emotions –Semitones=pitch sigma (2-4 semitones) –Range – difference between highest and lowest F o in sample of speech
Question Whose voice has the greatest frequency variation? A.Infants B.Children C.Adolescents D.Adults E.Seniors
Range of Freq. Variability Infantsgreatest range Hz Children Hz Adolescents64-95 Hz Seniors Hz
Question What can influence our voice intensity? A.Prosody of speech B.Emotions C.Social situations D.Health E.All the above
Amplitude Normal dB SPL –Prosody of speech –Emotions –Social situations –Health
Medications Adversely Affecting Voice Antidepressants Muscle relaxants Diuretics Antihypertensives (blood pressure medication) Antihistamines (allergy medications) Anticholinergics (asthma medications) High-dose Vitamin C (greater than five grams per day) Angiotensin-converting-enzyme (ACE) inhibitors (blood pressure medication) may induce a cough or excessive throat clearing. Pill may cause edema in the vocal cords due to estrogen. Estrogen replacement therapy post-menopause may have effect. Low level of thyroid replacement medication in patients with hypothyroidism. Anticoagulants (blood thinners) may increase chances of vocal cord hemorrhage or polyp formation in response to trauma.
Medical Conditions Affecting Voice Poor health Laryngitis Laryngopharyngeal Reflux Disease (LPRD) Voice misuse and overuse Benign vocal cord nodules Vocal Cord Hemorrhage Vocal Cord Paralysis and Paresis Neurologic related Laryngeal cancer
Voice Disorders Diplophonia –Muscle Tension Dysphonia (MTD) is a general term to describe excessive and unnecessary tension of laryngeal muscles during voicing. –MTD is often referred to by many different names including - hyperfunction, functional dysphonia, ventricular or false vocal fold compression, etc. –MTD is thought to be a compensatory mechanism in the presence of underlying laryngeal pathology. –Symptoms often include a sensation of excessive laryngeal tension and strain, vocal fatigue, and hoarseness. Neurologic –Spasmodic disphoniaSpasmodic disphonia –Spasmodic disphoniaSpasmodic disphonia